i don't buy into the whole "parts break whiel racing" thing. my old engine let go at 30mph, hardly a racing speed.
every car that is built may not have been specifically designed for racing, but they were all built with the knowledge that they could/would be called upon for some WOT acceleration. if it wasn't true, the car companies wouldn't design tb's/carbs that open all the way up.
personally i have never had a car leave me at the track for any reason. i have messed up a few parts before(used to break rear shocks regularly autocrossing), but nothing that would prevent the car from driving or i couldn't have messed up jsut cruising around town.
that being said, i can certainly appreciate a clean, well prepared show car. it is not my first choice of how to use a car, but i still see it as a legitimate use because i see cars as moving pieces of art. i jsut accept that some artwork moves faster than others